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  Subjects -> CHEMISTRY (Total: 838 journals)
    - ANALYTICAL CHEMISTRY (48 journals)
    - CHEMISTRY (587 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (46 journals)
    - PHYSICAL CHEMISTRY (68 journals)

ANALYTICAL CHEMISTRY (48 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 118)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 10)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 21)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 29)
Analytical Chemistry     Full-text available via subscription   (Followers: 223)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 25)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 5)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 16)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 18)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover   Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2302 journals]
  • New possibilities of atomic emission spectrometry for the determination of
           elements with high excitation energies
    • Abstract: Abstract Analytical characteristics of a high-temperature arc plasmatron with helium gas possessing high heat conductivity and high ionization potential as a plasma-forming gas have been investigated. A system of multichannel photoelectronic registration of spectra have been used in the scheme of a spectral instrument for atomic emission spectrochemical analysis. Based on the results obtained on examples of fluorine and chlorine, a procedure was proposed for the atomic emission spectrochemical determination of heavy excitable elements in powder samples.
      PubDate: 2015-05-01
       
  • Electrochemical biosensors based on dendrimers
    • Abstract: Abstracts The main features of work of electrochemical biosensors including dendrimers of various structures in the biosensing layer are considered. The role and importance of dendrimers as matrixes for the immobilization of biological components of biosensors and an increase in the density of receptors and mediators of electron transfer are revealed. Examples of application of various types of biosensors based on enzymes, immunochemical reagents, and nucleic acids are presented.
      PubDate: 2015-05-01
       
  • Spectrophotometric determination of tin(II) by redox reaction using
           3,3′,5,5′-tetramethylbenzidine dihydrochloride and
           N-bromosuccinimide
    • Abstract: Abstract A rapid, straightforward spectrophotometric method based on the redox reaction of tin(II) with a mixture of N-bromosuccinimide (NBS) and 3,3′,5,5′-tetramethylbenzidine dihydrochloride (TMB) was developed for determining low concentrations of tin(II). The redox method improved sensitivity by 2.3-fold relative to the existing spectrophotometric methods by titrating tin(II) into an equimolar solution of colorimetric reagent TMB and oxidant NBS buffered with acetate to pH between 4.0 and 4.4 at 25°C. The spectral absorption at 452 nm was linear with respect to tin(II) concentration between the limit of quantitation (LOQ, 10σ) of 0.05 and 0.34 μg/mL over which a response curve was generated (R 2 = 0.9981, n = 7). The limit of detection (LOD) was calculated (3σ) at 0.01 μg/mL. Deviation between actual and measured concentrations varied from 0.014 μg/mL near the LOQ to 0.042 at 0.255 μg/mL.
      PubDate: 2015-05-01
       
  • An enzyme-free electrochemical method for the determination of E. coli
           using Fe 3 O 4 nanocomposites with a SiO 2 shell modified by ferrocene
    • Abstract: Abstract An electrochemical immunoassay method is developed for determining the strain of Escherichia coli ATCC 25922 with the use of electroactive nanocomposite particles based on magnetite Fe3O4 coated by SiO2 modified with ferrocene as a signal label. A sensitive, direct, and easily measured analytical response is obtained by cyclic voltammetry. The developed method enables the determination of bacterial cells at a minimum concentration of 2.3 × 103 CFU/mL. The analytical range is 2.3 × 103–2.3 × 107 CFU/mL; the detection limit is 2.5 × 102 CFU/mL. The required sample volume is 0.5 mL, and the analysis time is 40 min.
      PubDate: 2015-05-01
       
  • Applications of high performance liquid chromatographic and
           spectrophotometric techniques for determination of rasagiline mesylate in
           dosage forms
    • Abstract: Abstract An HPLC method and first derivative-second derivative method for the quantitative determination of rasagiline mesylate, an antiparkinson agent, in dosage forms were developed and validated. In the HPLC, the chromatographic separation was achieved with a C18 column at 30°C and acetonitrile-waterperchloric acid (250: 750: 5, v/v/v) as eluent, at a flow rate of 1.0 mL/min using pseudoephedrine HCl as internal standard. Detection was carried out at 210 nm. On the other hand, rasagiline was determined by first derivative spectrophotometric technique by measuring the amplitude at 262, 266, 269 and 272 nm. Also, second derivative technique was performed at 264, 268, 271 and 273 nm. The Lambert-Beer’s plots for rasagiline mesylate showed linear relationships within 39–273 μg/mL for the derivative techniques. The results obtained by the developed procedures were statistically validated. The developed cheap and economical procedures were successfully applied to the determination of the studied drugs in pharmaceutical dosage forms.
      PubDate: 2015-05-01
       
  • Lead(II) ion selective poly(aniline) solid contact electrode based on
           1,2-bis( N ′-benzoylthioureido)ethane, -propane and -butane
           ionophores
    • Abstract: Abstract The lead ion selective electrodes were manufactured by synthesizing a benzoyl thioureido group ionophores having two sulfur groups on the both ends of ethane, propane and butane molecules. The ionophore containing propane moiety showed the best responsivity to lead ion. With the 1,3-bis(N,N′-benzoylthioureido)propane (BTP) ionophore, the best result was found when it included with the o-nitrophenyloctylether (o-NPOE) plasticizer with the highest permittivity and the oleic acid (OA) additive. The ratio of BTP: polyvinyl chloride: o-NPOE: potassium tetrakis(4-chlorophenyl)borate: OA was 2.5: 16.5: 30.5: 1.5: 0.5, the response range was 1.0 × 10−6.4–1.0 × 10−1.0 M, and the response slope was 30.4 mV/decade. Addition of OA led to an excellent result for the responsivity, cation interference effect, correlation coefficient, response time and reproducibility. The electrode represented constant characteristics irrelevant to variation of pH between 2–7, the stabilization time was 30 s, the response time was about 30 s, and the reproducibility represented ±0.81 and ±1.40 mV for 1.0 × 10−2.0 and 1.0 × 10−3.0 M lead, respectively.
      PubDate: 2015-05-01
       
  • Development and validation of UHPLC-DAD method for the determination of
           cholesteryl-hexahydrophthaloyl-5-fluorouracil in lipid nanoemulsion
    • Abstract: Abstract An ultra HPLC-diode array detector (UHPLC-DAD) method was developed and validated for rapid determination of cholesteryl-hexahydrophthaloyl-5-fluorouracil (CH5F) conjugate in standard drug, lipid nanoemulsion and dissolution samples. The chromatographic identification of this conjugate was achieved on Hypersil GOLD 50 × 2.1 mm reversed phase C18 column having a 1.9 μm packing as a stationary phase using methanol-water (80: 20, v/v) as a mobile phase, at a flow rate of 0.4 mL/min with DAD detection at 276 nm. The proposed UHPLC-DAD method is linear in the concentration range of 1–50 μg/mL with correlation coefficient of 0.998. The proposed method is precise, accurate, robust, sensitive and specific for analysis of the conjugate. High assay value (98.7%) of CH5F conjugate in lipid nanoemulsion was obtained by the proposed method. Forced degradation studies indicated that conjugate was sufficiently stable under oxidative stress conditions degraded under acid, base and thermal stress conditions. The proposed UHPLC-DAD method successfully and resolved drug conjugate peak in the presence of its degradation products which established stability and indicating property of the method. Results of the present study indicated that the proposed UHPLC-DAD method can be successfully used for routine determination of CH5F conjugate in standard drug and pharmaceutical formulations.
      PubDate: 2015-05-01
       
  • Sources of systematic errors in the gas-chromatographic determination of
           dialkyl o -phthalates in water
    • Abstract: Abstract The following sources of systematic errors in the determination of o-phthalic acid esters were established: the release of dialkyl phthalates from chromatographic self-sealing membranes, o-phthalate impurities in solvents, and the hydrolysis of o-phthalic acid esters. It was shown that the uncontrollable action of these factors can lead to a difference between the found and true concentrations of the test impurities by one or two orders of magnitude. Methods for taking into account and eliminating systematic errors were proposed. The purification of solvents by Rayleigh distillation makes it possible to obtain samples with impurity concentrations lower than (1–4) × 10−3 mg/L. The storage time of aqueous samples before analysis should be no longer than three days. Vessels for the sampling and storage of the test samples should be made of borosilicate or quartz glass.
      PubDate: 2015-05-01
       
  • Determination of markers of the urinary stone disease
    • Abstract: Abstract The capabilities of physicochemical methods (chromatographic, electrophoretic, potentiometric, and voltammetric) and also field test methods for the determination of the main markers of the urinary stone disease have been considered. The effect of various factors on the processes of stone formation has been discussed.
      PubDate: 2015-05-01
       
  • Capabilities of amperometric monoamine oxidase biosensors based on
           screen-printed graphite electrodes modified with multiwall carbon
           nanotubes in the determination of some antidepressants
    • Abstract: Abstract Amperometric biosensors based on planar screen-printed graphite electrodes modified with multiwall carbon nanotubes (MWCNTs) and immobilized monoamine oxidase enzyme (MAO) have been proposed for the determination of antidepressants (imipramine, afobazole, and phenazepam). The operation of the proposed biosensors is based on the inhibiting ability of antidepressants. The analytical capabilities of the proposed devices have been compared to those of biosensors based on the electrodes unmodified with MWCNTs. The proposed biosensors can be used for the control of both residual amounts of drug substances in biological fluids (urine) and the active ingredient in dosage forms.
      PubDate: 2015-05-01
       
  • Synergistic effect of perchlorate ions and acetonitrile medium explored
           for extension in copper redoximetry
    • Abstract: Abstract The impact of perchlorate ions and acetonitrile medium on copper redox couple was investigated. The acetonitrile solvent and perchlorate ions were found to synergistically increase the redox potential of Cu(II)-Cu(I) couple, thereby increasing its ability to oxidize more systems and expand the copper redoximetric analysis window. The difference in the behavior of thiourea towards copper(II) salts in aqueous and non-aqueous media was also explored. Based on the synergistic effect, an electroanalytical method for composition analysis of copper(I) thiourea complexes was proposed. Kinetic and quantum chemical studies have been used for mechanistic insight into synergistic effect of acetonitrile and perchlorate ions on copper redox couple.
      PubDate: 2015-05-01
       
  • Simultaneous ionic liquid aqueous two-phase extraction and
           spectrophotometric determination of amaranth and brilliant blue in food
           samples
    • Abstract: Abstract Aqueous two-phase system (ATPS) consisting of a hydrophilic ionic liquid 1-butyl-3-methylimidazolium bromide and K2HPO4, which is a novel, simple, fast, non-toxic and effective sample pretreatment technique coupled with UV-Vis spectrophotometry, was developed for the simultaneous separation, enrichment and rapid determination of amaranth and brilliant blue. Under the optimal conditions, the extraction efficiency for both analytes was nearly 100% in a one-step extraction. Linear calibration curves were obtained in the range of 25–2400 μg/L for amaranth and 4.5–1300 μg/L for brilliant blue. The limits of detection were 10 and 1.3 ng/mL for amaranth and brilliant blue, respectively. The method was applied to the simultaneous determination of amaranth and brilliant blue in beverages and candy samples. Compared with the results obtained by Chinese national standard method, there was no significant difference after being evaluated by t-test when the confidence level was 95%.
      PubDate: 2015-05-01
       
  • DP-sensors based on perfluorinated membranes modified with ZrO 2 for the
           determination of novocaine and lidocaine in polyionic solutions
    • Abstract: Abstract Cross-sensitive DP-sensors based on perfluorinated sulfonated cation-exchange membranes containing hydrated ZrO2 nanoparticles are used for the simultaneous determination of NovH+, LidH+, and K+ ions in aqueous solutions. A significant increase in the sensitivity of DP-sensors to NovH+ and LidH+ in solutions of NovHCl + LidHCl, NovHCl + KCl, and LidHCl + KCl compared to sensitivity to H3O+ ions interfering with the determination of corresponding organic cations is achieved by varying the concentration of ZrO2 in the membranes.
      PubDate: 2015-05-01
       
  • Photometric redox determination of iodate ions in bottled drinking water
    • Abstract: Abstract A photometric procedure is proposed for the highly selective determination of iodate ions in bottled natural drinking water treated with ozone. The procedure is based on the oxidation of Methylene Blue or Variamine Blue by iodate ions. The detection limits for iodates obtained with these reagents are 0.2 and 0.4 μg/L, respectively. In determining iodate ions with Methylene Blue, the permissible weight ratios of related ion are 1: 60 for BrO3 − and NO2 −; 1: 100 for ClO− and ClO2 −; and 1: 200 for ClO3 −, ClO4 −, IO4 −, I−, and Br−. In the case of Variamine Blue, the ratios of related ion are 1: 10 for BrO3 − and NO2 −; 1: 20 for ClO− and ClO2 −; and 1: 100 for ClO3 −, ClO4 −, IO4 −, I−, and Br−. In the concentration range of iodates of 1–10 μg/L, the total error of determination is 5–7%.
      PubDate: 2015-05-01
       
  • Solid phase microextraction combined with gas chromatography-mass
           spectrometry for the determination of diquat residues in water
    • Abstract: Abstract A novel method for the determination of diquat in aqueous samples was developed and applied to environmental water samples. The method involved sodium borohydride-nickel chloride (NaBH4-NiCl2) reduction and headspace solid phase microextraction (HS-SPME) of the perhydrogenated products. Gas chromatography-mass spectrometry was used to identify and quantify the analytes in selected ion monitoring (SIM) mode. The parameters and variables that affected the reduction and extraction were also investigated. The optimal conditions for the reduction were found to be 20 mg NaBH4, 200 μL 10% of NiCl2 (w/v) and heating at 90°C for 10 min. For the extraction, the SPME fiber was exposed for 20 min at 60°C. Using these conditions, the recovery rates of diquat ranged from 92.59 to 101.27% in water. Good linearity (y = 0.0769x + 0.2748, r 2 = 0.999) was obtained, intra- and inter-day precision were less than 3.99 and 5.64%, respectively. We found that reduzates of diquat exist as cis- and trans-isomers, and their ratio is 1: 5.3, with RSD of 13.1% (n = 17).
      PubDate: 2015-05-01
       
  • A capillary zone electrophoresis study of the effect of precursors and
           ultrasonic treatment on the morphology of hydroxyapatite particles
    • Abstract: Abstract A set of analytical techniques is proposed for studying samples of calcium hydroxyapatite (HA) synthesized on the basis of calcium nitrate or calcium hydroxide as precursors. A comparative study of particle size distribution in HA samples is performed using capillary zone electrophoresis (CZE), scanning electron microscopy (SEM), dynamic light scattering (DS), and static light scattering (SS). The effect of heat treatment on the morphology of the synthesized products is evaluated. It is found that the effect of ultrasound (US) on the dispersity of HA particles in aqueous suspensions depends on the nature of the precursor and heat treatment. It is shown that the HA particles synthesized from calcium hydroxide (HA-OH) aggregate more rapidly than the particles synthesized from calcium nitrate (HA-NO 3 ). After the ultrasonic treatment of suspensions, the relative concentration of large HA-NO3 submicroparticles increased, while particle size distribution in the suspension of HA-OH remained virtually the same. The heat treatment of HA powders at 900°C reduced the ability of particles to aggregate. It is found by CZE that, with increasing time of ultrasonication of suspensions, the relative concentration of nanoscaled and similar in size HA-NO3 submicroparticles increased markedly, while it changed only slightly in the HA-OH suspension. The reasons for the differences are discussed. A procedure for determining the concentration of HA submicroparticles in suspension by CZE is proposed. A linear dependence of normalized peak areas on HA concentration in suspension is obtained.
      PubDate: 2015-05-01
       
  • Stripping voltammetric determination of nicardipine using
           β-cyclodextrin incorporated carbon nanotube-modified glassy carbon
           electrode
    • Abstract: Abstract An electrochemical sensor modified with multi-walled carbon nanotubes-β-cyclodextrin (MWCNTs-β-CD) film was constructed and applied to the determination of nicardipine. The electrochemical behavior of nicardipine at the chemically modified electrode was investigated. After stripping of nicardipine on MWCNTs-β-CD film at −0.9 V for 1 min, a well defined oxidation peak was produced in 0.04 M NaOH. Determination of nicardipine has been further improved by the formation of inclusion complex of β-CD with nicardipine. The MWCNTs-β-CD film showed preferable analytical characteristics in electrocatalytic oxidation for nicardipine compared with the MWCNTs film and bare glassy carbon electrode (GCE). The surface morphology of MWCNTs-β-CD film was characterized by using electrochemical impedance spectroscopy. The calibration curve was linear from 1.0 × 10−7 to 2.0 × 10−5 M. The limit of detection was obtained as 1 × 10−8 M. The results demonstrated that this electrochemical sensor has excellent sensitivity and selectivity. The sensor was applied for determination of nicardipine in blood serum with excellent recoveries.
      PubDate: 2015-05-01
       
  • Determination of negundoside and agnuside in Vitex negundo by qNMR and
           method validation
    • Abstract: Abstract Negundoside and agnuside are reported as marker constituents for standardization of Vitex negundo (V. negundo) leaves. This is the first report on determination and quantification of negundoside and agnuside by qNMR in the leaves of V. negundo, collected from various regions of India. The developed qNMR method showed good linearity (r 2 ≥ 0.9994), high precision (RSD < 5%) and a good recovery (99.79 and 101.35%) for both the compounds. Therefore, the developed qNMR method is accurate and reliable for the quality control of V. negundo. The qNMR method is useful in quality control of plant extracts without the need of extensive sample preparation and chromatographic separation.
      PubDate: 2015-05-01
       
  • An ion-selective potentiometric sensor for hexafluoroarsenate
    • Abstract: Abstract Ion-selective potentiometric sensors (ion selective electrodes, ISEs) based on tetradecylphosphonium hexafluoroarsenate are developed for the determination of AsF 6 − ions. Their main parameters, such as selectivity, linearity range of response, detection limit, and also the effect of pH on the readings of electrodes are evaluated. The developed electrode demonstrated high selectivity to the AsF 6 − acido-complex in the presence of various anions. The detection limit goes up with increasing concentration of HF; for fluoridefree neat solutions of LiAsF6, it is 3 × 10−7, pAsF6 = 6.52; at the concentrations of HF 0.1 and 4 M, it is 1.5 × 10−6 M, pAsF6 = 5.82, and 7 × 10−6 M, pAsF6 = 5.15, respectively.
      PubDate: 2015-04-01
       
  • Development and validation of reversed phase HPLC method for the
           determination of vildagliptin using an experimental design
    • Abstract: Abstract A simple, robust and fast reversed phase HPLC method was developed and validated with UV detection (210 nm) for routine determination of vildagliptin. Chromatographic analysis was performed with mobile phase containing a mixture of 10 mM phosphate buffer (pH 4.6) and acetonitrile (85: 15, v/v) with flow rate of 1.0 mL/min. The procedure was validated as per International Conference on Harmonization (ICH) guidelines for linearity (correlation coefficient r 2 = 0.999), accuracy, intermediate precision and robustness. Experimental design was used during validation to calculate method robustness and intermediate precision. For testing robustness three factors were considered: pH of buffer, flow rate and percentage (v/v) of acetonitrile. From the analysis it was observed that an increase in the flow rate results in a decrease of drug found concentration, while the pH of buffer and percentage of organic modifier have no significant effect on the response. To measure intermediate precision, the variables considered were: analyst, equipment and number of days. The relative standard deviation (RSD) value (2.25%, n = 24) indicated a good precision for analytical method. The proposed method was simple, accurate, precise, sensitive and cost effective for further determination of vildagliptin.
      PubDate: 2015-04-01
       
 
 
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